Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5c873d0e00e4b3…

MALICIOUS

PDF

69.9 KB Created: 2021-05-20 20:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 010185115753d28c9ce2cc2aa95a3238 SHA-1: 710b6559d64ad96a9f0c63ae8a5721fc14fd419b SHA-256: 6d5c873d0e00e4b323cd83031f09b43115621ca014d0878157bc0d37f93e5342
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for a link farm, directing users to a suspicious URL on 'kuzutuzo.ru'. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to educational content, likely to mask a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8129

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/strik?utm_term=math+word+problems+with+answers+grade+4 PDF link annotation
    • https://netebina.weebly.com/uploads/1/3/4/5/134596662/dd6a66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_6038f2718fd56.pdfIn PDF document text
    • https://netajetuz.weebly.com/uploads/1/3/4/6/134651380/5076447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478655/normal_6025ce3c97105.pdfIn PDF document text
    • https://poxawakepuk.weebly.com/uploads/1/3/1/6/131606289/a524e35522112e.pdfIn PDF document text
    • https://rozomibevepozif.weebly.com/uploads/1/3/0/7/130775668/panegalaxifabuviv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_6027c96d6d9db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6279a65f-e143-4154-84af-94a381280582/is_lg_refrigerator_reliable.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/97335010903.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/56761762978.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/plant_molecular_biology_reporter_issn.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/20642753931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ad5584-7ab6-4795-8338-f969f24a0e49/37080711109.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/fresh_graduate_resume_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/70528409636.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/darkest_dungeon_character_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/kofikozobakum.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/titration_curve_of_all_amino_acids.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/96128620150.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/zitakujiz.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/vubovifarowidorip.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 5700 bytes
SHA-256: 56506de55ad84ec293bc486ef80495f2ff416250185ba23b884e7b858283f203

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